When I forgot a resistor on my PCB prototype, how do I add it?
There is a redidtor forgotten in prototyping, then I need to add it into a data line. The data line is a trace and carries low speed data. A through-hole resistor will be fine. The pins for both ends of the trace are exposed, but how do I add the resistor and remove the trace?
If your PCB has a solder mask you can fix this with an SMT resistor even when traces are close together. Cut the trace and scrape the solder mask away on both sides of the cut.
I use a small screw driver for breaking the trace and scraping the solder mask off the two ends for my project.